Influence Of The Underlying Land Surface Pattern Change On The Thermal Environment In Suzhou

The urbanization is the product of the social economic development. With the development of the urbanization, the city urban areas expand and the underlying land surface patterns change. Especially in the developed cities or regions, the urban land use and land cover types have undergone a fundamental change, a large number of ecological lands were replaced by city areas every year, which causes changes of lots of natural phenomenon and ecological process as well as effects on the quality of human life. In which, the urban heat island is a typical phenomenon. Therefore, to understand the thermal environment change of the city and urban sustainable development, it has important theoretical and practical significance to study evolutions of the urban underlying land surface pattern and its influence on the thermal environment variation.By selecting Suzhou, Jiangsu province as the study area and using remote sensing data combined with GIS technology, the thesis adopts the landscape ecology theory to study the change of the underlying land surface pattern and its effect on the change of the urban thermal environment. This thesis mainly includes:(1) analysis on the spatial distribution characteristics of the underlying land surface and its dynamic evolution;(2) the temporal and spatial distribution characteristics of the urban thermal environment;(3) the quantitative analysis on the effect of the underlying land surface pattern change to the urban thermal environment.The results show that:(1) because of the urban expansion during the recent20years in Suzhou, the land use changed as sharply reduced of farmland and the increase of urban areas;(2) according to the temporal and spatial evolution of the landscape pattern indices, the landscape fragmentation aggravates and the average plaques areas decrease in Suzhou;(3)according to the retrieval results of the land surface temperature from1986to2006, the area of the urban heat island shows an obvious increase;(4) it has close relation between the change of urban thermal environment and landscape pattern indices, there is a positive correlation between the thermal field variation index and Shape_MN、SHDI while it is negative with Area_MN、CONTAG and AI, this indicates the evolvement of underlying land surface patterns have an effect on the change of the thermal environment to some degree;(5)since1990s, urbanization process continues to accelerate, change extents from1995to2006are more obvious than that from1986to1995.